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Mick, the floating arrow in the VMA shows where libration is favorable, but you need to look at the "Libration in Latitude/Longitude" numbers on the 'ephemeris' tab to see how favorable things actually are.

The numbers tell how many (negative) degrees over the limb we can see... the lower the number, the more favorable the libration. Best i've ever seen was almost -8. If you were looking for favorable libration predictions on specific features though, i'm not sure if the program does that or not.